We usually go for Thanksgiving week. It seems to me that they add to the decorations every night. By the end of the week the lights are really on display.
We're banking on it - heading down 11/10 - 11/17. MVMCP starts around that time so at least you know MK will be done. I'm really looking forward to seeing the Osborne Lights and the gingerbread houses at the GF.